Worries that the mercury in certain fish could harm young children prompted the government Friday to issue new guidelines for eating fish.
NASA announced Tuesday the discovery of evidence that water once existed on the surface of Mars, creating conditions that may have supported life. NASA scientist Jim Garvin explains the findings and implications.
The Spirit rover drove into a Martian hollow, while halfway around the planet, its twin dug a trench with one wheel to investigate the soil's content. Ray Suarez discusses the latest findings with Steve Squyres of Cornell University, principle investigator…
Dr. Elias Zerhouni, director of the N.I.H., is spearheading efforts to speed up the time it takes for laboratory discoveries to be translated into new medical treatments and drugs. Susan Dentzer talks to Zerhouni and other researchers about the proposed…
By PBS NewsHour
Researchers in South Korea succeeded in extracting stem cells from a cloned human embryo.
NASA's robotic rover, fully recovered from computer problems that plagued it for more than two weeks, drilled into a Martian rock over the weekend in search of evidence that water once flowed on the arid planet.
NASA celebrated the successful landing of its second rover, Opportunity, Saturday night on the opposite side of Mars from its twin rover, Spirit.
The NASA rover Opportunity landed in a shallow crater on Mars over the weekend and transmitted back images of a smooth red surface punctured with bedrock outcroppings. Ray Suarez discusses the mission and its findings with Orlando Figueroa, director of…
Europe's Mars orbiter has found the most direct evidence yet of water in the form of ice in the south polar cap of Mars, the European Space Agency announced Friday.
NASA's rover Spirit has failed to transmit data from Mars for more than 24 hours in what mission scientists thought at first was a weather-related interruption but now believe could be a serious hardware or software problem.
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